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Is null reference possible?
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Detection of dereferenced null pointers in typeid works based on syntax, instead of based on semantics. That is, if you do typeid(0, *(ostream*)0) you do have undefined behavior - no bad_typeid is guaranteed to be thrown, even though you pass an lvalue resulting from a null pointe...
Warning “Do not Access Superglobal $_POST Array Directly” on Netbeans 7.4 for PHP
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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Best algorithm for detecting cycles in a directed graph [closed]
...s been mentioned in several answers; here I'll also provide a code example based on chapter 22 of CLRS. The example graph is illustrated below.
CLRS' pseudo-code for depth-first search reads:
In the example in CLRS Figure 22.4, the graph consists of two DFS trees: one consisting of nodes u, v,...
C# Thread safe fast(est) counter
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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Install tkinter for Python
... from sources, but this is usually not the best idea with a binary package-based distro you're apparently running.
It's safer to apt-get install python-tk on your machine(s).
(Works on Debian-derived distributions like for Ubuntu; refer to your package manager and package list on other distribution...
Unable to generate an explicit migration in entity framework
...processed migration in your application and it requires running Update-Database before you can add another migration.
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Automatically import modules when entering the python or ipython interpreter
... will allow you to change the startup requirements and other configuration based on a particular case. However, if you'd always like np to be available to you then by all means put it in the startup directory.
For more information on ipython configuration. The docs have a much more complete explana...
Add a column with a default value to an existing table in SQL Server
...raint will not be used and NULL will be inserted as the Value.
Notes were based on everyone's great feedback below.
Special Thanks to:
@Yatrix, @WalterStabosz, @YahooSerious, and @StackMan for their Comments.
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Why do you need explicitly have the “self” argument in a Python method?
...etimes don't.
Python elects to make things like this explicit rather than based on a rule.
Additionally, since nothing is implied or assumed, parts of the implementation are exposed. self.__class__, self.__dict__ and other "internal" structures are available in an obvious way.
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JNI converting jstring to char *
...StringUTFChars(javaString, nativeString);
Can fix this errors:
1.error: base operand of '->' has non-pointer type 'JNIEnv {aka _JNIEnv}'
2.error: no matching function for call to '_JNIEnv::GetStringUTFChars(JNIEnv*&, _jstring*&, bool)'
3.error: no matching function for call to '_JNIE...